diff options
Diffstat (limited to 'yocto-poky/meta/recipes-core/udev/eudev/udev-cache')
-rw-r--r-- | yocto-poky/meta/recipes-core/udev/eudev/udev-cache | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/yocto-poky/meta/recipes-core/udev/eudev/udev-cache b/yocto-poky/meta/recipes-core/udev/eudev/udev-cache new file mode 100644 index 000000000..dcfff1cb4 --- /dev/null +++ b/yocto-poky/meta/recipes-core/udev/eudev/udev-cache @@ -0,0 +1,75 @@ +#!/bin/sh -e + +### BEGIN INIT INFO +# Provides: udev-cache +# Required-Start: mountall +# Required-Stop: +# Default-Start: S +# Default-Stop: +# Short-Description: cache /dev to speedup the udev next boot +### END INIT INFO + +export TZ=/etc/localtime + +[ -r /proc/mounts ] || exit 1 +[ -x @UDEVD@ ] || exit 1 +[ -d /sys/class ] || exit 1 + +[ -f /etc/default/rcS ] && . /etc/default/rcS +DEVCACHE_TMP="/dev/shm/udev-cache-tmp.tar" +SYSCONF_CACHED="/etc/udev/cache.data" +SYSCONF_TMP="/dev/shm/udev.cache" +DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen + +# A list of files which are used as a criteria to judge whether the udev cache could be reused. +CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices" +[ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags" + +# List of files whose metadata (size/mtime/name) will be included in cached +# system state. +META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*" + +# Command to compute system configuration. +sysconf_cmd () { + cat -- $CMP_FILE_LIST + stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}' +} + +[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache + +if [ "$ROOTFS_READ_ONLY" = "yes" ]; then + [ "$VERBOSE" != "no" ] && echo "udev-cache: read-only rootfs, skip generating udev-cache" + exit 0 +fi + +[ "$DEVCACHE" != "" ] || exit 0 +[ "${VERBOSE}" == "no" ] || echo -n "udev-cache: checking for ${DEVCACHE_REGEN}... " +if ! [ -e "$DEVCACHE_REGEN" ]; then + [ "${VERBOSE}" == "no" ] || echo "not found." + exit 0 +fi +[ "${VERBOSE}" == "no" ] || echo "found." +echo "Populating dev cache" + +err_cleanup () { + echo "udev-cache: update failed!" + udevadm control --start-exec-queue + rm -f -- "$SYSCONF_TMP" "$DEVCACHE_TMP" "$DEVCACHE" "$SYSCONF_CACHED" +} + +( + set -e + trap 'err_cleanup' EXIT + udevadm control --stop-exec-queue + sysconf_cmd > "$SYSCONF_TMP" + find /dev -xdev \( -type b -o -type c -o -type l \) | cut -c 2- \ + | xargs tar cf "${DEVCACHE_TMP}" + gzip < "${DEVCACHE_TMP}" > "$DEVCACHE" + rm -f "${DEVCACHE_TMP}" + mv "$SYSCONF_TMP" "$SYSCONF_CACHED" + udevadm control --start-exec-queue + rm -f "$DEVCACHE_REGEN" + trap - EXIT +) & + +exit 0 |